The Doctor: 'Alas, poor Peri, not for us the pleasures of Phaestor 95... I am a living peril to the universe. If this poor hive is to be cleansed, there's only one recourse - contemplation, self-abnegation in some hellish wilderness - ten days, ten years, a thousand years, of what consequence is time to me? I shall become a hermit, and you, child, shall be my disciple.'
The Twin Dilemma